Abstract
When citrate export from mitochondria is blocked with 1,2,3-benzenetricarboxylate (BTC) during the G1/S phase of the cell cycle, both DNA synthesis and cell growth are dramatically inhibited in suspension-grown 70Z/3 murine lymphoma cell cultures sustained under otherwise optimal conditions. Synchronized (G0/G1 or G1/S) and unsynchronized cultures are susceptible to this phenomenon. BTC prevents two requirements from being met. (1) It deprives the cytosol of the acetyl CoA necessary for operation of the cholesterogenesis pathway, thereby depleting the supply of mevalonate (MVA) implicated as a requirement for triggering DNA synthesis. (2) It behaves as a nonmetabolizable divalent cation chelator, reducing the availability of Ca2+ and Mg2+, which, in whole cells are both required for DNA synthesis. Such inhibitions are reversible. In whole cells, removal of the inhibitor yields rapid and complete recovery of DNA synthesis. During the prolonged presence of BTC, the addition of MVA plus the Ca2+ ionophore A23187 allows partial recovery of DNA synthesis. In isolated, DNA synthesizing nuclei, on the other hand, the slight inhibition of DNA synthesis by BTC is reversed merely by addition of Mg2+. We conclude that the uninterrupted pr...Continue Reading
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